Grammar › Conditionals
Conditionals
Quick answer
English has four main conditionals (plus mixed ones), each imagining a condition and its result:
- Zero — always true (If you heat ice, it melts).
- First — a real future (If it rains, I'll stay home).
- Second — an unreal present (If I won, I'd travel).
- Third — an unreal past (If I had known, I'd have helped).
The tense in the if-clause signals how real the situation is: present = real, past = imaginary, past perfect = an imagined past.
| Conditional | Use it for | Example |
|---|---|---|
| Zero Conditional | General truths and facts | If you heat ice, it melts. |
| First Conditional | A real, likely future | If it rains, I'll stay home. |
| Second Conditional | An imaginary present or future | If I won the lottery, I'd travel. |
| Third Conditional | An imagined, different past | If I had studied, I would have passed. |
| Mixed Conditionals | Two different time frames combined | If I had studied medicine, I'd be a doctor now. |
Which conditional?
- Is it always true? → zero conditional (If you press this, it beeps).
- Is it a real, likely future? → first conditional (If it rains, I'll stay in).
- Is it imaginary or unlikely now? → second conditional (If I were rich, I'd travel).
- Is it an imagined past? → third conditional (If I had known, I'd have helped).
Related grammar points
- First vs Second Conditional — Real future or imaginary?
- Second vs Third Conditional — Unreal present or unreal past?
- Wishes: I wish / if only — Regrets and things you'd change
- Unless, as long as, provided that — Conditional linkers beyond ‘if’
- If vs When — A possibility or a certainty?
- Inversion in Conditionals — Had I known…, Were I you… (formal)
Frequently asked questions
How many conditionals are there in English?
Four main ones — zero, first, second and third — plus "mixed" conditionals that combine time frames.
What is the difference between the first and second conditional?
The first is for a real, likely future (If I have time, I'll help). The second is for imaginary or unlikely situations (If I had time, I'd help).
Why do conditionals use past tenses for the present?
In the second and third conditionals, a past tense signals that the situation is imaginary, not that it happened in the past.
Can I put the if-clause second?
Yes. "I'll help if I can" = "If I can, I'll help." Use a comma only when the if-clause comes first.